A Pathfinder: Discovery, Invention and Industry: How the World Came to Have Aquadag and Oildag; Also Carborundum, Artificial Graphite and Other Valuable Products of the Electric Furnace. The First of a Series of Educational Biographical Sketches of Eminent Inventors

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A Pathfinder: Discovery, Invention and Industry: How the World Came to Have Aquadag and Oildag; Also Carborundum, Artificial Graphite and Other Valuable Products of the Electric Furnace. The First of a Series of Educational Biographical Sketches of Eminent Inventors